From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4BB8BC04EBF for ; Wed, 5 Dec 2018 22:54:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0D642208E7 for ; Wed, 5 Dec 2018 22:54:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D642208E7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728691AbeLEWyQ (ORCPT ); Wed, 5 Dec 2018 17:54:16 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56900 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727670AbeLEWyP (ORCPT ); Wed, 5 Dec 2018 17:54:15 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8F3CCA7DD; Wed, 5 Dec 2018 22:54:15 +0000 (UTC) Received: from redhat.com (ovpn-122-208.rdu2.redhat.com [10.10.122.208]) by smtp.corp.redhat.com (Postfix) with SMTP id 17ABD5C69A; Wed, 5 Dec 2018 22:54:09 +0000 (UTC) Date: Wed, 5 Dec 2018 17:54:09 -0500 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: maxime.coquelin@redhat.com, tiwei.bie@intel.com, wexu@redhat.com, jfreimann@redhat.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang Subject: [PATCH RFC 0/2] virtio-net: interrupt related improvements Message-ID: <20181205225323.12555-1-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Mutt-Fcc: =sent X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 05 Dec 2018 22:54:15 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that we have brought the virtio overhead way down with a fast packed ring implementation, we seem to be actually observing TCP drops indicative of bufferbloat. So let's try to enable TSQ. Note: it isn't clear that the default pacing is great for the virt usecase. It's worth trying to play with sk_pacing_shift_update to see what happens. For this reason, and for a more important one that I didn't have time to test it yet, sending as an RFC. Michael S. Tsirkin (2): virtio-net: bql support virtio_net: bulk free tx skbs drivers/net/virtio_net.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-) -- MST